Publications by authors named "Warren B Bilker"

This study aims to identify predictors of success in treating chronic pain patients with full agonist opioids by analyzing harmonized individual patient data from 5594 participants in 9 enriched enrollment randomized withdrawal clinical trials available in the Food and Drug Administration data repository. We analyzed both the participants' success with titration and continued success in the 84-day maintenance phases after randomization for those maintained on the drug. We used the full data set to assess participant demographics and subsets of data containing participant reported outcomes at baseline.

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Introduction: No prediction models exist for the success for buprenorphine initiation in opioid-naïve patients or in transition from other opioids in patients treated for chronic pain.

Objectives: To create a prediction model for the successful use of buprenorphine to treat chronic pain.

Methods: Stepwise Akaike information criterion prediction modeling procedures were applied to a harmonized participant-level data set of 10 enriched enrollment randomized withdrawal clinical trials of buprenorphine submitted to the Food and Drug Administration.

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Background: The epidemiology of community colonization with extended-spectrum cephalosporin-resistant Enterobacterales (ESCrE) in low- and middle-income countries (LMICs) is largely uncharacterized. In the community, the household is of particular importance. Identifying risk factors for household ESCrE colonization is critical to inform antibiotic resistance reduction strategies.

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The lack of established minimum clinically important differences in acute pain has made it challenging to interpret efficacy in analgesic trials. We performed a patient-level re-analysis of double-blind, placebo-controlled trials submitted to the US Food and Drug Administration to estimate minimum clinically important differences in acute postoperative pain. Trials were categorized by acute surgical pain model: dental extraction, bunionectomy, orthopedic surgery, and soft tissue surgery.

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Women with HIV (WWH) were found to have an increased risk of abortion-related infection relative to women without HIV (WWoH) and those without HIV status documented. This relationship persisted even after accounting for factors such as mechanical injury on pelvic examination, a marker of the least safe methods of self-induction. Whether this complication in WWH is because of immunocompromise or behavioral characteristics requires additional investigation.

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Objective: Prior studies demonstrate that some untoward clinical outcomes vary by outdoor temperature. This is true of some endpoints common among persons with diabetes, a population vulnerable to climate change-associated health risks. Yet, prior work has been agnostic to the antidiabetes drugs taken by such persons.

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Article Synopsis
  • * A study using Medicaid claims from 2003 to 2020 assessed the overdose rates among users of methadone and different statins, specifically comparing P-gp-inhibiting statins (simvastatin, atorvastatin, lovastatin) with rosuvastatin as a control.
  • * Results showed no significant association between the use of P-gp-inhibiting statins and opioid overdose risk, indicating that using these statins alongside methadone may not increase the risk compared to using rosuvastatin.
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In a prior screening study, saxagliptin, a dipeptidyl peptidase-4 inhibitor (DPP-4i), was found to have an increased rate of serious bleeding when used concomitantly with several oral anticoagulants (OACs). We aimed to confirm or refute the associations between concomitant use of individual OACs and DPP-4is and serious bleeding in a large US database, using self-controlled case series (SCCS) and case-crossover (CCO) designs. The study population was eligible Medicare beneficiaries co-exposed to a DPP-4i (precipitant) and either an OAC (object drug) or lisinopril (negative control object drug) in 2016-2020.

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Outcomes in patients requiring prolonged inotropes (PI) following surgery for congenital heart disease (CHD) have not been well studied. We aimed to describe the burden of PI use in the immediate postoperative period after CHD surgery and identify risk factors for in-hospital mortality. We conducted a retrospective cohort study using the Pediatric Health Information System® (PHIS) database.

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Article Synopsis
  • The self-controlled case-series (SCCS) design is used in studies to evaluate drug-drug interactions (DDIs), focusing on the comparison of incidence rates when taking two drugs together versus one alone.
  • Inaccuracies can arise when inferring day-level drug exposure from dispensing claims, which may lead to biased incidence rate ratios (IRRs), particularly when using grace periods that assume treatment effects continue after medication runs out.
  • Research findings indicate that misclassifying the precipitant (the drug causing the interaction) consistently biases the IRR towards null, while misclassifying the object drug can bias it in various directions; to reduce bias, it is recommended to avoid grace periods for object drugs and include a washout period after
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Background: Serious illness conversations (SICs) in the outpatient setting may improve mood and quality of life among patients with cancer and decrease aggressive end-of-life care. Interventions informed by behavioral economics may increase rates of SICs between oncology clinicians and patients, but the impact of these interventions on end-of-life spending is unknown.

Methods: This study is a secondary analysis of a stepped-wedge cluster randomized, controlled trial that involved nine medical oncology practices and their high-risk patients at a large academic institution between June 2019 and April 2020.

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  • Direct-acting oral anticoagulants (DOACs) are often prescribed alongside antiseizure medications (ASMs) for patients with both atrial fibrillation (AF) and epilepsy, but enzyme-inducing ASMs may lower DOAC effectiveness, increasing the risk of thromboembolism.
  • The study aimed to compare rates of thromboembolic and major bleeding events in adults with AF and epilepsy using DOACs alongside enzyme-inducing ASMs versus those using non-enzyme-inducing ASMs.
  • Results showed an incidence of 88.5 thromboembolic events and 68.3 major bleeding events per 1000 person-years; using enzyme-inducing ASMs was associated with higher
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The global rise in polypharmacy has increased both the necessity and complexity of drug-drug interaction (DDI) assessments, given the growing potential for interactions involving more than two drugs. Leveraging large-scale healthcare claims data, we piloted a semi-automated, high-throughput case-crossover-based approach for drug-drug-drug interaction (3DI) screening. Cases were direct-acting oral anticoagulant (DOAC) users with either a major bleeding event during ongoing dispensings for potentially interacting, enzyme-inhibiting antihypertensive drugs (AHDs) (Study 1), or a thromboembolic event during ongoing dispensings for potentially interacting, enzyme-inducing antiseizure medications (ASMs) (Study 2).

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  • * Analyzing data from over 229,000 patients who started statin therapy, researchers found that a 10% increase in adherence to statins correlated with a lower likelihood of dying on very hot days (≥39°C).
  • * Results indicate that this protective effect is more pronounced in men than women, suggesting the potential benefits of statin adherence during heat waves.
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Concurrent use of skeletal muscle relaxants (SMRs) and opioids has been linked to an increased risk of injury. However, it remains unclear whether the injury risks differ by specific SMR when combined with opioids. We conducted nine retrospective cohort studies within a US Medicaid population.

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With the increasing prevalence of marijuana use in the US, many deceased organ donors have a history of marijuana use, raising concerns about infectious risks to transplant recipients. We performed a multicenter retrospective cohort study in which exposed donors were those with recent marijuana use (in the prior 12 months) and unexposed donors were those with no recent marijuana use. Primary outcomes included the following: (1) positive donor cultures for bacteria or fungi, (2) recipient infection due to bacteria or fungi within 3 months posttransplant, and (3) recipient graft failure or death within 12 months posttransplant.

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Background: A study previously conducted in primary care practices found that implementation of an educational session and peer comparison feedback was associated with reduced antibiotic prescribing for respiratory tract diagnoses (RTDs). Here, we assess the long-term effects of this intervention on antibiotic prescribing following cessation of feedback.

Methods: RTD encounters were grouped into tiers based on antibiotic prescribing appropriateness: tier 1, almost always indicated; tier 2, possibly indicated; and tier 3, rarely indicated.

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Lack of laboratory capacity hampers consistent national antimicrobial resistance (AMR) surveillance. Chromogenic media may provide a practical screening tool for detection of individuals colonized by extended-spectrum beta-lactamase (ESBL)-producing organisms. CHROMagar ESBL media represent an adequate screening method for the detection of extended-spectrum cephalosporin-resistant (ESCrE), isolated from rectal swabs.

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Introduction: Persons with Parkinson disease (PD) are hospitalized at higher rates, have longer lengths of stay, and are more likely to die in the hospital than age-matched peers. Although prior studies have compared inpatient outcomes between persons with and without PD, little is known about inpatient outcomes across the PD trajectory, or whether hospitalizations occurring in the last 6 months of life differ from earlier hospitalizations.

Methods: This cross-sectional study compared Medicare Part A and B beneficiaries aged 65 and older with a qualifying PD diagnosis who were hospitalized in 2017: decedents who died between 7/1/2017 and 12/31/2017 from all causes and were hospitalized at least once in their last 6 months of life, and non-decedents who were hospitalized between 1/1/2017 and 6/30/2017 and lived 6 or more months after discharge.

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Introduction: To end the HIV epidemic in Philadelphia, implementation of evidence-based practices (EBP) to increase viral suppression and retention in HIV care is critical. Managed problem solving (MAPS), an EBP for antiretroviral therapy adherence, follows a problem-solving approach to empower people living with HIV (PWH) to manage their health. To overcome barriers to care experienced by PWH in Philadelphia, the EBP was adapted to include a focus on care retention and delivery by community health workers (CHWs).

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Rates of cigarette smoking in people with HIV (PWH) are two to three times higher than in people without HIV. Nicotine is metabolized by CYP2A6 and the nicotine metabolite ratio (NMR; 3-hydroxycotinine/cotinine) is a measure of nicotine clearance. Higher NMR has been observed in PWH and is associated with lower quit rates.

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The ROC curve and its associated summary statistic, the AUC, are used to identify informative diagnostic biomarkers under the assumption that risk of disease is a monotone function of the biomarker. We refer to biomarkers that meet this assumption as traditional, and those that do not as nontraditional. Nontraditional biomarkers most often arise when both low and high biomarker values are associated with an outcome of interest, such as blood pressure with medical complications or leukocyte count with ICU prognosis.

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Article Synopsis
  • The study investigates the prevalence and risk factors for extended-spectrum cephalosporin-resistant Enterobacterales (ESCrE) colonization in Botswana, focusing on low- and middle-income countries where data is limited.
  • Participants included 2000 individuals, with data collected on demographics, health background, and potential exposure risks.
  • Key risk factors identified for ESCrE colonization were healthcare exposure, foreign travel, livestock contact, and having a household member already colonized, emphasizing the need to develop effective strategies for reducing antibiotic resistance.
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Background And Objective: Current studies of end-of-life care in Parkinson disease (PD) do not focus on diverse patient samples or provide national views of end-of-life resource utilization. We determined sociodemographic and geographic differences in end-of-life inpatient care intensity among persons with PD in the United States (US).

Methods: This retrospective cohort study included Medicare Part A and Part B beneficiaries 65 years and older with a qualifying PD diagnosis who died between January 1, 2017, and December 31, 2017.

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